801-3. Hybrid system
PRIUS c_U■
Sounds and vibrations sp ecific to a hybrid vehicle
There may be no engine sound or vibration even though the vehic le is able to
move with the “READY” indicator is illuminated. For safety, app ly the parking
brake and make sure to shift the shift lever to P when parked.
The  following  sounds  or  vibrations  may  occur  when  the  hybrid  sy stem  is
operating and are not a malfunction:
● Motor sounds may be heard from the engine compartment.
● Sounds  may  be  heard  from  the  hybrid  battery  (traction  battery)  under  the
rear seats when the hybrid system starts or stops.
● Relay operating sounds such as a snap or soft clank will be emi tted from the
hybrid  battery  (traction  battery),  under  the  rear  seats,  when  the  hybrid  sys-
tem is started or stopped.
● Sounds from the hybrid system may be heard when the back door is open.
● Sounds  may  be  heard  from  the  transmission  when  the  gasoline  engine
starts or stops, when driving at low speeds, or during idling.
● Engine sounds may be heard when accelerating sharply.
● Sounds may be heard due to regenerative braking when the brake  pedal is
depressed or as the accelerator pedal is released.
● Vibration may be felt when the gasoline engine starts or stops.
● Cooling fan sounds may be heard from the air intake vent on the side of the
lower part of the rear left seat.
■ Acoustic Vehicle Alerting System
In  the  following  cases,  the Acoustic  Vehicle Alerting  System  so und  may  be
difficult for pedestrians, people riding bicycles or other people and vehicles in
the surrounding area to hear:
● When there is a lot of noise in the vicinity 
● When it is raining or during strong winds
● When in the area surrounding the rear of the vehicle, rather than in front of
the vehicle
■ Maintenance, repair, recycling, and disposal
Contact your Toyota dealer regarding maintenance, repair, recyc ling and dis-
posal. Do not dispose of the vehicle yourself.